Air conditioners rarely die without warning. They drop hints — sounds, smells, small performance changes — sometimes for a whole season before they fail on the year's hottest day. Here are the seven signals we hear about most from Hamilton homeowners, in rough order of urgency.
1. It's running, but the air isn't cold
First, rule out the simple things: thermostat set to "cool," filter not clogged, outdoor unit not buried in cottonwood fluff. If those check out, weak cooling usually means a refrigerant leak or a failing compressor. Refrigerant doesn't get "used up" — if it's low, it leaked, and topping it up without fixing the leak is renting a repair instead of owning one.
2. Ice on the refrigerant lines or indoor coil
Ice means something is starving the system — airflow (dirty filter, blocked returns) or refrigerant. Turn the system off and let it thaw before a technician visits; running it iced can slug the compressor with liquid refrigerant, turning a modest repair into a major one.
3. Short cycling
Starting and stopping every few minutes is hard on the compressor — like city driving versus highway. Causes range from a dying capacitor to an oversized system. Worth diagnosing promptly, because the component it wears out is the expensive one.
4. The breaker trips
Once, after a storm? Reset it and move on. Repeatedly? A motor or compressor is drawing too much current, and each restart hits it harder. Stop resetting and have it looked at.
5. Water where it shouldn't be
A puddle by the indoor unit is usually a clogged condensate drain — a quick, affordable fix. Left alone, it soaks drywall or trips the float switch on the muggiest day. If you see it, mention it at your next service call at minimum.
6. New noises
- Grinding or screeching: motor bearings — shut it down.
- Buzzing: often electrical — contactor or capacitor on the way out.
- Repetitive clicking: a relay trying and failing to start something.
7. Your hydro bill crept up
Same weather, same habits, higher bill — the system is working harder to do the same job. Sometimes it's a $30 filter; sometimes it's the first symptom of the compressor aging. Efficient operation and reliable operation tend to decline together.
The pattern in all seven: small symptoms are affordable; ignored symptoms compound. Nobody ever regretted the inspection.
Repair or replace?
Our honest rule of thumb: multiply the repair cost by the system's age. Under $5,000-ish, repair usually wins; well over, start pricing replacement. A 14-year-old unit needing a $900 repair deserves a bigger conversation — and if a quote you got elsewhere feels heavy, our second opinion is free. Family owned and operated since 1989; we'd rather tell you the truth than sell you a unit.
